It's great once you set the volume, but if you want to change any settings using the turn wheel you have to stop and take the ipod out and then lock it (so the setting don't change)...that's my only issue thus far.

I like it because the neoprene feels good on the skin and doesn't chafe. The only issue i think is with the arm band, which although stretchy and therefore an easy fit for most arm types, it only has a tiny bit of velcro on it, so i think it is better suited to people with larger arms. Often times i find it slipping down my arm a tiny bit until i really pull the strap through to adjust it (and i have quite big arms.) Other than that it is actually quite good.